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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '545f1ca2411331c4135cdbfe3ed6ecfc31115d2f6cb7c2c8e7763ae6d9b95d9e' 
  AND token = 'dBrndYqwS5YMVXrr+lMEa/G66bhYE9aTpqE1L+JC/jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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