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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf60f79506350bf06e6d8d283b7d7c243f3a039f8f0d68bd3500c900ec4ec16' 
  AND token = 'rlHjvWqE4rqf1mUomlF3nuyO+slOs1QqnrQqhcwqDDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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