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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c909432d4591d8ae9817d78537de7eb9962cfc492ed2ebeca2d5eb071f5c050b' 
  AND token = '3TNtMqlFp4SGO9cyMzk2O2hRIKi8R9Bxn5W2keatdoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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