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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ce5ab386fff9228fc5b712220bc9e90db976949e9b4b82bed1759655a32416' 
  AND token = 'vrrwvCLcgNCOfzL4ybcRZh/rcpC8mYb4Dklld6wbWdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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