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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87b008ddaa7a7ec8ce1a164bbe34626af3416048f1304126f9cb612b0ea69e8' 
  AND token = 'KG1OApEwOKcbmgt52GikH0uwM5esvPGvMOygn6YlZZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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