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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5956cb46090811f475d1677ef577bfc7a5e0590c3608e2cc827dc843a44d89ba' 
  AND token = 'd8/LGM1VtNYpKX7EAvpp5F3F0kpQYozHEhSfGTTHT+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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