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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c62379a25022fc6a962d2825be15ef8d241154aad7cf089c868e7f4cb65b48' 
  AND token = 'Xd1cGJk8DRDwcP2AunBITfLtU28N6MxOUq9CNBoY/S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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