SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32e4caa77af7891966b1f00a78e049d29b84d2779a47ba628081c8dd10553aa' 
  AND token = 'kTTjrgmOllwpkA1Y0J/ZAIk/uu+w+o2vsYVSxIRWEAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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