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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30844ff4356bdf122a4d84a0d809e0e919f9bcc8f75710aafc7b57aa37e80d7' 
  AND token = 'mZTeWMSL9vAloJXq8ufnQVs89kj2zyIVMKthmX46s1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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