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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98e4dbea582d40c8d17c1cc169aaf329a782cfa0ae5ff57ea90bbb0ba0eb5eb' 
  AND token = 'JrQuAjuJFgohpReMz/m6Zygw6fJIZJwf/pru6eyCtaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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