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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f40687fc8f24315b9574ec2d03ed9ff9c1c5f84494a55fdbc2bd1f167985271' 
  AND token = 'kvtoOU9BQhxXXoO3XI2xdNo89ZerfXU9RHE6//+OMlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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