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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78aa3a7f108444ae6420317e9f162ff0cc759a382df557d0fe54d2a92fa2dca5' 
  AND token = 'QqblCD14baIG9su+CJzbQ4LRIIryQov+j3ss9ZL1X3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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