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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f2a70928120e0ebe3b321e910a9cebef47f11caddf156634199b69ac0ffd43' 
  AND token = 'ch6fC/DXlEmCp5BWLfnElPU5ooFFz7WvusTShksIoKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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