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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8d44d864731f4c1d7dd9cd4c19ca46372b4305835c4efa74c47035045284f5' 
  AND token = 'IT9A/PpxXeFOUtIw4QVCTQjp9tKe04JnvGI9lfLXZGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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