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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d91862d668c958af7a9f6ab66862671f3db105658d6800c85e71d4b7694d5a' 
  AND token = 'mo33wRE7evgm2HrZeyU/DWn001BGctvA2qZz1ZzMmlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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