SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ac7894878ab1b66fe7136cac334179bd7c46942cdbc9296e06d1657fd7152a' 
  AND token = 'C4vndurFjKzJoi7BFXJSW4QYn2NTwyewVy8ghEmEjzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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