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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee8060f690573f88625697f4b73917a43394f23b4085eef5500aa14f73a5596' 
  AND token = 'XA2Q0NErwD4oxNDZLRRG9BKPz9OoDcAEhfqkBqr7W6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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