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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d52a6a75782abd938f36eda43f6d8907c3955e5ea5a96f846a2414f3eb17009' 
  AND token = 'TbJ7phO82uGPsFIpaN1OTF5NGeX2g5w0LrulBzen5m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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