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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ddb1d749002700c61b56876af9b5ea34e1aa8c6b13858d9e9599388c7ed7a86' 
  AND token = 'bJaJd7rsELCcE5m+n5md75bSEGOiOC9LxoQAua/oPP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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