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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2290e4fbb81b6cddda3063b083a4025a6c5061aafbd002ebcde828992f6c7100' 
  AND token = 'o6u+JRioeA7qyK4WyopkRl1ZXRfePULLhTq5Vt48Bbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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