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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0a807c1ad0c69a8ea319316c49e4b9fed053f909a49e4152d52559618a49ef' 
  AND token = 'EEY0B1+vYLSra+u9O5GJPGF69n0fQjpzeekM/ttjOaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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