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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f746ae4823fc24027a2b67d19e710f2b3c96b3c270e5d453c7c2c75d816c91b1' 
  AND token = 'ZVI9RCGudf8fae/mAV8ht7Kqz775QdlJ3GU0rLizfZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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