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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7adbf6733327c11f3450df4938fb56e8ba3bac828bff3e1fac82f7678be7a3' 
  AND token = 'gSrgm7wz6EYnUKFuA98plzUq/eLSQQ4bNr/mzAq1DSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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