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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a84c902e14e4cff37fbe9ae2952a01af20d54bc710846e3550f2d9a5a749456' 
  AND token = 'LLf2LvfrEOXIE2cZqtQjsj9Ikd7oDmwve6NneHsTysE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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