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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1115f5f1170c032616e8c08bb2caffcd34228d23a874bf5c33ce45fe3a13f046' 
  AND token = 'IhLSsSrB3Q2Is7RLUZk8ZTG1LFCiLIvVeHiMHwX/toE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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