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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5590feff1c4fc1778f77c966f6adbd12cac951d076f699b7b027a535d7e913' 
  AND token = 'IBo0wnV/EBP4DoENq2OZefY97Gw76dDwlxWho8p6D2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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