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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da29999ca5e1c13593258884f73991e01fc1841406d73c1bc9d9813502a16bfa' 
  AND token = '+fgh+yhZ6G9x82EtFy1j8cQyNWgf1339sA2RpcEMGcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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