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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5b57fce519d993f63c664c26ebffeb3b91da24cd5fdb4b5accd43c941ed3ef' 
  AND token = 'MUk/lDZzMTZ5VctsITRR72N9VeZonZKkjTIV3n11fKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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