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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fb8d6c6003e241e45cda230694df626d263fe309bd6f3f1568f415bbdbbf9d' 
  AND token = 'EdZ1EvEok8zmEuihLbaSSkkOnzgqXc9+WNygmc4H0UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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