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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ac5befaa6eb666492bdef6dc1c8c4ea749c7838c25a5362eca592c23471249' 
  AND token = 'J3tbMHuFtke2gu58DlUyMrXdPmKjLStDcd6BFlP4sBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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