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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b153ccf168d4f615003b25ed3304bba2b6464b5b469c67606ed731f522e4cc' 
  AND token = 'jxU7p1MLeTs0ak8PWYx2lFOdzhFoU3JFKDCL/v9OH/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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