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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cadb1a1d4e3b951f0a6a8812ffd6d7e6996bf34906db8f4a99656052c4830ba' 
  AND token = 'YyYv1Of+6f71QZpz3Y3FKQCBI/40ynlMa9XnJPtccY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}