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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f19d001a7085b3705b272d325da2764e086b83e2f613c462b7ff7703437bcf0' 
  AND token = 'HRIjMwSaGPqxBJjdEK+G0w4TjIuOZB02JRTrsgWsIE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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