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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b276f325483b220d75b7edf770a599ff844bbce54bf8a35780c0c229c819ba' 
  AND token = 'Fw/ytOy7oUzGj7fWWJ+lDQgbErRewqEvjAl0An4/OT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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