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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '248cd9742e9a856781c5589c9dc2ed126d5968057c4bf0e81221de977ba1224d' 
  AND token = 'CHYkWsvFQFsm5PDxq3yH9RffAMU9BZosy2kqaMGeCcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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