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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c4beb0e8c3446ef4b8939a8ece669d4634400e105ff89cd565489e3af8d917' 
  AND token = '9KjeNjmUVW4jeNVLYzgqjf/NI3qFSKCNJB7RzeuZIAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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