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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0874a78d5f451bd57c7aaa248febc6916bddb20e40adb7dbbefbf242a240bc4d' 
  AND token = 'IwlcNx6CmNmQ6sRa9k38vTL1v/RU89Nxvbz79mCirp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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