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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97571e673f7d2e4e26ec99901a3d1111cd88c0e5a1deb62517de31e64f42e285' 
  AND token = 'wVzr5Wq8bHf4oosL+24Ogg/CR3SARZgLm+BTMmOvTr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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