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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf9647eaed64f55b1e80a952c3442a39a29a9eb7412f9393ad70b09c19e14a6' 
  AND token = 'Rud3O4XXxeC7z2caM9YFuQytE2xAb4C2m/oft5hbvSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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