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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ce221dffa84b342043dcfdff256f250b29910c0d088e2daa2f4bbe60a7d358' 
  AND token = 'rpqK4S5IhzCPn8Ui9a36ppnansVHqnAM+5HvylELn80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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