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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f359955d36b6dcbeca53681271e24aa45aa36a32bd228498528d8cbb707165a' 
  AND token = '8lii7rnEF0HAGzUOEQoIay9iQthscXsim+g5nf3hT2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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