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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca2295e477fb53abd45a54bca1003f172296ad620edff79dcf4287ec8b6988d' 
  AND token = 'JncXeaYg/fokErT/XegPhFCpAcd5EypevBKLTT8YAOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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