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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9167c6f2b0be200e3b8fb746cc04d4031e848eb31b85bcc8e42816a5d6c6be76' 
  AND token = '62E5ovMaFOgMws72TOPni7Ljy9+PA1ExtW7ujmcficY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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