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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1479cfcb0577a3d2c3f83ebf483eeb40165092c7338dbdf9885b1e1c35e0cf' 
  AND token = 'cvP1Sw+vuvIoU5uw3EgS6KJJ/Lz/kM5No29H7DaridU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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