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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5145c7c75906fd416a6ca21f394ef20679be04ffb8933f8ecd29ed8456244b' 
  AND token = 'n+m4FhAiRrzP095QS12En1VAwJkfzgdYZPc9s6IgxtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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