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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59ed58ef7fcdb0511ce5932d92f993be74931a4aa7f65ff95a431d8867de333' 
  AND token = 'YqQdkudXF+bsv8GNTixmu6o64VbvOY7bedaCVHKVsbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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