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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d30099230151f49eae1bec475be681a6b000321c88bcafacc43176401c7ea4f' 
  AND token = 'r23XiAxDC5ivdkKfTGV+9f0HHr7X53Cp5FkVtbziido=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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