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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640454edce01e75d77fc121d60ecc700ce50851b6f98f79e69b63c7c96f9cd24' 
  AND token = 'klq0eEbmzj8rF7cmmmeHCi7uygOMac/aGFVl3UwTavk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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