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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237e2529618bf918d5fce2e6aa42f1a709b6be031335e4f1951a6ecaa001a0a1' 
  AND token = 'jS/8xI5eNcHRoOw2F7AT8rex5unL6cDn2892F1o/+3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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