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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a834c91fd1d24a736c2809860f9a811329e155d758e4c8670671fccc3f9e23' 
  AND token = 'nrcdAya1RnwSLFqthGU+NDL9Jhhd3P3RGVn6U69k80o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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