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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30059e8f7864d66d9c75ba3d7841755875c3b09fd49f72c79d588b60b49c09a0' 
  AND token = 'FGyIAtAlBLGkeyemXgriJ1cwdnd7JLC+j/Q0oTwTEnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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