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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e119434a233149c66e9bd3e30efc971efc5b844f807cae66715bde68517f51c' 
  AND token = '9h+WiHHMa385Ke35vvuKtpLYdmoQn32lkJGW5GssKmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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