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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61719f569f22544e695432c6ba902616d7b6b3ed913fbe309e409eb960eb4648' 
  AND token = '/ItDmC0yrm7Aj6JCW+FOJUOLb5rSc7G3pTYTlWeel0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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