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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c074e6ff43a6bfa9d0a36dfe8fca76bad48c9909d865a56c100d6de72140712' 
  AND token = 'CS8M2CaOhRBC8uAgP6eM9XQDBvu1M2dOSHOi9uuEtLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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