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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70d7ea9f8eea2e8892699d9c832fb4463d869eea76efa734eb8fdfc2bb55d9c' 
  AND token = 'k08UYjnxh0zWqqXOq1UU6T2YECyhcLyjnZ59JGrRUWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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