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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee4c91fd6f53c350242a64f7e0a4b4d228b5194af6d2ac96ef531ba3556ae20' 
  AND token = '2kYTdZm0vgWqUbtC4mLPI1mOjPq4yb8FhjTfbyWv4cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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