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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2463c53b0abeb2e6310be179da46de7053415332ef39ab8c78ae3a8fd70c12' 
  AND token = 'RXgkTtlwN3NmpBDdfICLZdDtS6p+bKSADwM857Ti1wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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