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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d118ddbed60a2357f45d408a6a7f1a4d97adee27807c10c70b95df34bca607f' 
  AND token = '67IvadzkppDwNUNSIu/thqzwCoK8ZA6YZ1lPRViun5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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