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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5235dfcaf947eb89b488f685e89e514aae2994e1eb1ef6663aab38b1acb1dcb7' 
  AND token = '4pJMxmQIOsEPjPS/DT6xoQf3whFlDj/F/PChzYNxztk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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