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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37dd3096f6f9ad3440d3986113fe9c1545d574820722f4f9694a6ce80855d5dc' 
  AND token = '1Q35PbwZibPsl8qEQz30qqQhss95WmwO9mV0vcbBam8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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