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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2f9ee4c33f61652c28f2fb65862bffbff7a90fb2356eb82280b495eab1bbb3' 
  AND token = 'yk/daldGw7Y7su1QoWOgSS8HGqGHsECV0EsPIAd+4rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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