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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686fdc464fabfb80e8cc6eed0f99e92a79deb39d37b063a0d196df19ba5c207f' 
  AND token = '/mWq39Z8VbkacWa3JCLVywq+MTeNrY/zW7hAUsGPeDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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