SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50371446519be413b8bc5795547c6a496b22046b3421ff03b2b687defb82183e' 
  AND token = 'W/p+Tko7n5+9iRvhVspjrHNHHe/Yq2+Q3VJmyKKiWRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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