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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2fa581795048a334043117868fccff125f297cb68e19a6e03b79a0d6f13240' 
  AND token = '9VWD+IdBQ+0X/enYQeD7ReDVT3CknLbiohvxLhNDE78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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