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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6504e92239af5ab589c1e435e178b308444842d76be692695e0501f424a19a' 
  AND token = 'B3PG1LZ9NpJ8/w6GJCCd0EhvIyKEbTmsiMEg+fTPaT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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