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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96fd4e468d5809d1b974ed1f8c5ac18c6696efcd55085c6cff22eda3f43faa67' 
  AND token = 'CkrwZpXkks31R2iMyhZ0uqsCGwf9wsdtLvOnDPUvv88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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