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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a034c136ad2bddfbddbf97b14248be4920a1d1a36a2a3b39fe2592f597a26b5' 
  AND token = '6djoZyPBqStZkocPsg1/z7HVitZGeZfEjOw0BAEXX0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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